Friction or adhesion gearing



April 3, 1928. 1,665,165

E. H. J. C. GILLETT FRICTION 0R ADHESION GEARING Filed April 10. 1926 2 Sheets-Sheet l yWZ fuzz-5172 0.21.

April s, 1928. 1,665,165

E. H. J. C. GILLETT lled April 10. 1926 2 Sheets-Sheet 2 In venian 5105172522 Aa i Patented Apr. 3, 1928. y

- a "I i E WARD HENRY JAMES CECIL ernrnrr, or HA rs'rnAn; LONDON, ENGLAND. 7

' nn o'rron on enrztnsron GEARING. s

; Application filed April 10, wee-seri l na'loiisaa a inereat Britain September 110, 1925,. ,7

This invention relates to epicyclic frictional power-transmission gearingof the vkind comprising an inner and an outer race ring with a plurality of interposed planetary transmitting rollers connected to one .ofthe transmitting shafts, one of said race rings being radially resilient andprovided with pressure devices acting to vary the contact pressure of the transmitting parts proportionately to the torque to be transmitted- A prior proposal has been made to construct a gearv of this type in which the pressure devices consist-of-a number of single rollers, symmetrically disposed around the gear between an outer radially rigid ring and inner radially resilient ring furnished with a number of plane surfaces to impart a wedging action to the said rollers.

An object of the present invention is to obtain a more uniform-loading of the trans- .mitting parts in a gear of-the type referred to and to secure {an initial binding pressure 7 sufficient toensure the operation of the gear and arelative movement'between the parts such as to bring into action the pressure devices which serve to vary the contact pressure proportionately tothe torque to be transmitted. 1

i .To this end, epicyclicfriction gearing of the type set forth. embodies according to s the present invention an axially vdisplaceable element loaded in any I convenient manner end providedfwith'a coned orrta pered portion engaging the resilientwrace ring in suchwise as to exert a radial pressure thereon serving thereby to malritainthefcontact pressure. of the transmitting parts.

' 'Where the inner racering is resilient, this ingly coned surfaceon one inner edge of the element may conveniently take the formof a spring-loaded sleeve slidably mounted on one of the transmittingshafts and provided with a coned faceengaging a'correspondresilient ring,the axial thrust being taken I 'bvsimilarly toned surfaces on the other inner edge .of said ring. v V

Furthenaccording to the present inven- .-tion, 'insteadof a single roller disposed so as to become wedged, upon rotation of resilient .ring, pairs of rollers are provided thrust apart by springs. This arrangement engagement of one roller of each pair between-the surfaces aforesald as soon as the parts are rotated, thereby ensuring a per fectly uniform distribution of pressure throughout the gear and eliminating the possibilityof one or, more wedging rollers engaging before the others and thereby tending to thrust the parts ofi "centre; C

In a preferred form of theinvention the high speed shaft .or Ian elemfinl connected it thereto is furnished with a Series .of planeor suita le" curv d ur aces symmetrica ly posed 'arounclsaid element, with thepairs of pressure rollers arranged between said surfaces and" a rad ally res lient ring, and-the planetary transmitting rollers runn g tween the outer surface of this ring and the i n r sur a eo a x d ing, the latter rollers being carried in a cage connected to-the low speed shaft; i i.

The planetary transmitting rollers may be m un si p y inbush si, inhal or other bearingsin thcjoage, or it is ,desired 7 to provid an automatic ad ustmenti for I wear said rollers be journalled in blocks 'sliclable radially in guides in the cage. v

The accompanying drawings illustrate by a1 sea-1on0? the gear .Fig-

a se t ona i w lot thel ases owring the pla tary rollers journa le i bushes in thecage', i V I Eig.4-i.s'a similarview-showing the rollers journalled in blocks sil'idah e ra ially theeage. i

Referring to these drawings v:

The casing madein two parts bolted together carries a fixed race B betweenwh ich and aninn'ef esilient race 01mins a set of planetary rollers Dwho'se-enids DKare'jOurto the lowspeed shaft G, the cage F being located'axilally by,bearings, F and The high-speed shaft H carries at its inner 3 end an enlargement J furnishedwith a sym-' inetri alfs ri s oifiats orfplane surfaces formedby th chords of its ircumferen nalled in bushes 'Elborne by a cage 1F bolt d I V Betw en a h fla and he. r sil n ra 0,

wh ch latter is forme in two part veach l ca ed a pai st o rs th us apar by a results in theimmediate simultaneous;

c r -K 50 ha upon r ta on o t mu emitting parts in one direction one rollerlK flats andthe race C, rotation in the contrary sense serving similarly to .Wedge the other I rollers K of each pair, the wedging effect andco'nsequently the radialpressure exerted on the race ncreasing automatically with increase oftorque.

-Mounted to slide axially on theshaft II r i and engaging the opposite tapered edge. of

the race C. A clearance is provided between the faceplate L? and the part J to allow an automatic adjustment for wear.

r the cage to allow automatic adjustment for In this manner a uniform initial pressure is applied to the race C acting to prevent any unequal wedging action of the rollers K. A filling hole P for lubricant is provided in the casing. y

In the arrangement illustrated in Fig. 3

a the ends D of the rollers D are simply journalled in'bushes E- in the cage F.

In Fig. 4, said ends 1) are shown mounted in blocks Q, slidable'in radial guides R in wear.

What I claim is i 1. Epicyclic frictional transmission gearing comprising. a fixed and a movable race-ring, one of which is radiallyresilient, a plurality of planetary rollers running between said rings and an axially displaceable spring-loaded member provide'd'wit-h a-tapered portion engaglng the resilient ring in suchwise as to 'exerta radial pressure thereon, a plurality ofiwedging surfaces associated with the resilient ring and a set of devicessuch as rollers arranged between the wedging surfaces and the resilient ring and acting to vary the radial pressure applied to the latter proportionally to the torque'to be transmitted.

2. Epicyclic. frictional transmission gearing comprising an inner and anouter racerlng one of, which is radially resilient, a plurality of planetary transmitting rollers running between said rings, an axially displaceable spring-loadedmember tapered to en.-

- gage the resilient ring so as to exert a radial pressure thereon, a plurality of rollers symmetrlcally disposed in pairs around the gear between the resilient ring and a series of wedging surfaces the rollers of eachpair. beingthrust apart by springs so that upon rotationof the parts in either direction one roller of each. pair becomes wedged. simul- 7 taneously and acts to vary the contactpressure of the transmitting parts proportionally to the torque to be transmitted.

- 3. Epicyclic frictional transmission gearas claimed in claim 2 and in which the inner race-ring 1s radially resilient and the axially displaceable member is constituted.

by a spring-loaded sleeve slidable on one of the transmitting shafts and provided with a coiled face engaging one I correspondingly coned inner edge of the resilient ring,.with' a similarly coned axially fixedsurface engaging the other edge of the resilient ring to take the axial thrust thereon.

4aEpicyclic frictional transmission gearing comprising an inner and an outer racering, the inner one being radially resilient, a plurality of planetary transmitting rollers running between said rings, a series of wedging'surfaces symmetrically arranged around the periphery of a boss on the inner 'end of one of the. transmitting shafts, .a springloaded sleeve on the said shaft provided with a tapered surface engaging a similarly tapered innerv edge of the resilient ring, an.

axially rigid tapered member to take the thrust on' the opposite inner edge of said ring a plurality of rollers symmetrically disposed in pairs aroundthe gear between the resilient ring and the aforesaid surfaces on the boss of the shaft, the rollers of each pair being thrust apart by springs so that upon rotation of the parts in either direction one roller of each pair becomes wedged simultaneously and acts to vary the contact pressure of the transmitting parts proportionally to the torque to be transmitted.

5. Epicyclic frictional transmission gearing comprising aninner and an outer racering, the .inner one being radially resilient, a plurality of planetary transmitting rollers runningbetween said rings'and mounted in blocks slidableinradialguides'in a cage, a series of wedging surfaces'symmetrically arranged around the periphery of a boss on the inner end of one of the transmitting shafts, a spring-loaded sleeve on the said shaft provided with a tapered surface en'- gaging a similarly tapered inneredge of, the

resilient-ring, an axially rigid tapered memher to take the thrust on thefopposite inner edge of said ring, a plurality of'rollers symmetrically disposed in pairs, around the gear between the resilient ring and the aforesaid surfaces on the boss of the shaft, the rollers of each pair being thrust apartbysprings so that upon rotation of the parts in either direction one roller of each pair becomes wedged simultaneously and acts to vary the contact pressure ofthetransmitting parts proportionally to the torque to be transmitted. i

EDWARD HENRY JAMES CECIL GILLETT. 

